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(3-x)(0.5x-6)=0
We add all the numbers together, and all the variables
(-1x+3)(0.5x-6)=0
We multiply parentheses ..
(+0x^2+6x+0x-18)=0
We get rid of parentheses
0x^2+6x+0x-18=0
We add all the numbers together, and all the variables
x^2+7x-18=0
a = 1; b = 7; c = -18;
Δ = b2-4ac
Δ = 72-4·1·(-18)
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{121}=11$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-11}{2*1}=\frac{-18}{2} =-9 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+11}{2*1}=\frac{4}{2} =2 $
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